diff --git a/www/boris/conf.php b/www/boris/conf.php
index 85ccb54..e086028 100644
--- a/www/boris/conf.php
+++ b/www/boris/conf.php
@@ -26,4 +26,4 @@ default     120x 90 Large Preview
 */
 
 define('YOUTUBE_THUMB', 'https://i.ytimg.com/vi/%s/mqdefault.jpg');
-define ('MEDIAQR','https://'.HOST.'/ipns/%s/QR.png');
+define ('MEDIAQR','https://'.$_SERVER['SERVER_NAME'].'/ipns/%s/QR.png');